How To Tell The Difference Between A Male (Cock) & Female (Hen) Trout
A male Trout is referred to as a Cock and a female is known as a Hen. The obvious difference between a Cock and a Hen Trout is that when a Hen is gutted in spawning season they contain orange eggs inside... Some Hens have these orange eggs all year round. However I have come across a few Hen Trout that have not had eggs in spawning season...
When the Trout are in full spawn the Cock (Male) fish develops a very prominent "underbite" where it's jaw extends quite far out, similar to Salmon when they breed. On larger specimens, out of the spawning season, a bigger jaw can be observed on the Cock fish opposed to a rounder proportional mouth that the Hen has. Please see the images below for differentiation:
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